Rubber dumbbell



FIG. 1 is a perspective view of the rubber dumbbell of the present invention;

FIG. 2 is a top view of the dumbbell of FIG. 1;

FIG. 3 is a bottom view of the dumbbell of FIG. 1;

FIG. 4 is a front view of the dumbbell of FIG. 1, the back view being an identical image; and,

FIG. 5 is a side view of the dumbbell of FIG. 1, the other side view being an identical image. 

CLAIM The ornamental design for the rubber dumbbell, as shown and described. 